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 Replies: 11 / Views: 1,716 |
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Pillar of the Community
Australia
1511 Posts |
Just showing photo of any coin to yous I have worked with metals I know a weak spot when I See one,anyhow take a look on few coins yourself At same spot I showed in photo and you'll see The line through.   Any year take a good look.  |
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Pillar of the Community
 Australia
1511 Posts |
Oh jody Clark coins I haven't checked.
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Pillar of the Community
 Australia
2526 Posts |
I think I get what you're alluding to now.
You say that the design of the coin, with the valleys of the chin, ear lobe, hair and crown all roughly aligned, make a "weak spot", or a "stress raiser", pretty much regardless of the year?
The Ox moves slowly, but the Earth is patient.
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Pillar of the Community
Australia
2526 Posts |
Wouldn't have thought it would cause a delamination in a coin. There errors generally occur from impurities in the blank stock material, inclusions of slag, gasses trapped in the manufacturing process, inadequate mixing of the various metals that make up the alloy material. See what others think of your observation.
The Ox moves slowly, but the Earth is patient.
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Pillar of the Community
Australia
1511 Posts |
Yes this was what I had been getting at I know its Delamination this may raise questions ive seen A few coins with Cuds from back of hair and the Occasional coin with cover voids if you understand What I'm saying how the mint covered double bar. |
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Pillar of the Community
Australia
2526 Posts |
Not sure I follow the double bar thing. Run that past me please.
The Ox moves slowly, but the Earth is patient.
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Pillar of the Community
Australia
1511 Posts |
The Australian 1980 coat of arms 50 cent coin known as the double bar. Well on reverse side at the back of the emu's head there is 2 lines that was not intended too be there,the lines are also on some 1979 & 1981 50 cent coins, ram mint Also decided That they would void/cover that area where double lines Were,that's what I see at back of the queens Head. |
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Pillar of the Community
Australia
1511 Posts |
On some coins you'll see the void x and others it looks like hair but that line is still running through coin nevertheless |
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Pillar of the Community
Australia
2526 Posts |
Now I think I see what you are alluding to. Your method of typing sentences is hard to follow at times (no offence meant).
I'm not sure if your take on the double lines appearance / disappearance is 100% accurate but I'll give it a coat of looking at. Interesting all the same.
The Ox moves slowly, but the Earth is patient.
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Pillar of the Community
Australia
2526 Posts |
Double bar 50 cent pieces 1979-1980 Posted on 10 July 2020 (coincuriosity.com) Although the original design for the 50c piece had two parallel bars behind the emu's head, the coins which were eventually produced for circulation did not. Reportedly the double bars reduced the life of the dies and were removed from the final design http://www.cruzis-coins.com/50c/1980d.html). According to Renniks the double bars were removed from working dies after die filling was noticed around the double bars (p80, Skinner, Renniks Australian Coin and Banknote Values, 1989). Whatever the case, the double bars were not a part of the final production design. The 50c pieces of 1966 can show weak double bars, and faint double bars have appeared behind the emu's head in many years since 1966. Their occasional reappearance is probably due to incomplete removal from master tools, though it is possible that the faint double bars are nothing more than Die Deterioration, which the area behind the emu's head was found to be prone to. Double bar 50c break-downs Year Mintage Normal Double bar 1979 24,886,000 91.7% 8.3% 1980 38,681,000 76.6% 23.4% In 1979 and 1980, a number of 50c pieces did have strong double bars behind the emu's head, much like those on a pattern 1966 50c piece (Crellin, https://www.sterlingcurrency.com.au...-by-machin/). The strong double bars on circulation coins are only known in 1979 and 1980 and while the reason is unknown, it is likely some dies were produced using master tooling where the double bars had not been removed at all. Although the double bar coins are the less common variety they are not rare. Oddly the usage of the double bar design increased in 1980 before disappearing altogether. The Ox moves slowly, but the Earth is patient.
Edited by ttkoo
07/30/2022 5:04 pm
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Pillar of the Community
Australia
1511 Posts |
Yes that's the one any ways I put coin on ebay too sell For a few weeks see how it goes. |
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Pillar of the Community
Australia
1511 Posts |
Typing on phone not very good at but I try to make things Clear an appropriate, understandable etc..... |
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Replies: 11 / Views: 1,716 |
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Posted 07/26/2022 04:27 am
